Influence of physicochemical parameters on stability
and performance of biosupported Pd nanocatalysts

• Authors: Simon De Corte , Tom Hennebel , Jeroen Segers , Sam Van Nevel , Stephanie Verschuere , Willy Verstraete , Nico Boon
• Languages of publication: EN

Abstracts

EN

Sustainable production methods for catalytic palladium (Pd) nanoparticles
are currently being investigated due to their increasing use, limited
availability and price volatility. The bio-palladium (bio-Pd) method uses
bacteria as a producer and carrier of Pd nanoparticles. In this method,
Pd leaching results in economical loss and environmental risk. In this
study we therefore investigate the influence of different parameters on the
leaching process: temperature (4-21°C), medium (H2O or mineral medium),
pH (1–12), atmosphere (air, O2, N2, H2) and bacterial carrier. We show
leaching is an important phenomenon for biosupported Pd: 20% of the Pd
was released at 21°C in water after 100 days. Minimal leaching occurred at
lower temperatures, low pH and in an isotonic medium. Up to 5 times more
leaching was observed under anaerobic conditions (H2 or N2 atmosphere)
than under aerobic conditions (O2 or air atmosphere). The producer/carrier
Cupriavidus metallidurans leached up to 5% zerovalent Pd compared with
20% in Shewanella oneidensis. No loss of catalytic activity due to leaching
was observed when the leachate remained in the reaction medium. This
paper shows for the first time that release of Pd nanoparticles from the
bacterial carrier of bio-Pd can be significant particularly under anaerobic
conditions, at high temperature or high pH.

Keywords

EN

Bio-Pd; Leaching; Catalysis; Bionanotechnology

• Publisher: Versita
• Journal: Nanomaterials and the Environment
• Year: 2013
• Volume: 1
• Pages: 31-39

Dates

received

04 - 10 - 2012

accepted

05 - 2 - 2013

online

19 - 02 - 2013

Contributors

author

Simon De Corte

• Laboratory of Microbial Ecology
  and Technology (LabMET),
  Ghent University, Coupure Links 653,
  B-9000 Gent, Belgium

author

Tom Hennebel

• Laboratory of Microbial Ecology
  and Technology (LabMET),
  Ghent University, Coupure Links 653,
  B-9000 Gent, Belgium

author

Jeroen Segers

• Laboratory of Microbial Ecology
  and Technology (LabMET),
  Ghent University, Coupure Links 653,
  B-9000 Gent, Belgium

author

Sam Van Nevel

• Laboratory of Microbial Ecology
  and Technology (LabMET),
  Ghent University, Coupure Links 653,
  B-9000 Gent, Belgium

author

Stephanie Verschuere

• Department of Pathology,
  Ghent University, De Pintelaan 185,
  B-9000 Gent, Belgium

author

Willy Verstraete

• Laboratory of Microbial Ecology
  and Technology (LabMET),
  Ghent University, Coupure Links 653,
  B-9000 Gent, Belgium

author

Nico Boon

• Laboratory of Microbial Ecology
  and Technology (LabMET),
  Ghent University, Coupure Links 653,
  B-9000 Gent, Belgium

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Identifiers

DOI

10.2478/nanome-2013-0002